Studies on engineering properties of red seaweed (Kappaphycus spp.)
2009
Balingasa, C.R., Camarines Sur State Agricultural Coll., Pili, Camarines Sur (Philippines). Dept. of Agricultural Engineering | Elepaño, A.R., Philippines Univ. Los Baños, College, Laguna (Philippines). Agricultural and Bio-Process Div.
Tensile strength, density, porosity, specific heat, thermal conductivity and thermal diffusivity of red seaweed (Kappaphycus spp.) were determined within a moisture range of 46.8 to 975.3% dry basis (31.9 to 90.7% wet basis). Tensil strength was based on the ratio of breaking load and linear density; density was measured using the relationship between mass and volume of the seaweed; specific heat was determined by using a calorimeter with toluene as a heat transfer medium; thermal conductivity was obtained using a modified Fitch set-up; and thermal diffusivity was computed from the experimentally determined values of thermal conductivity, specific heat and density. Tensil strength of seaweeds increased from 2.61 to 37.3×10sup-4 N/tex with decreasing moisture content. Bulk density was found to vary between 88.5 to 383.9 kg/cu m. Specific heat and thermal conductivity values obtained increased from 1.38 to 3.99 kJ/kg deg C and 0.221 to 0.304 W/m deg C, respectively with increasing moisture. Thermal diffusivity ranged from 1.98 to 18.1×10 sup-7 sq m/s. Regression equations showing the relationships of moisture content with the engineering properties of red seaweed were presented. Results of the study can be used in the design of process equipment such as dryers and moisture meters.
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